You are studying recessive mutations of three autosomal, linkedgenes in guinea pigs: fur color (y, yellow);fur texture (wv, wavy); ear size(l, large). The data in columns A and B was obtained fromcrosses of heterozygous F1 females with homozygous testcross males(recessive for all three traits).
Column: A Â Â Â Â Â Â Â Â Â Â BÂ Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â CÂ Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â DÂ Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â E
F2 Phenotype | # Observed | Corresponding Genotype | P or SCO or DCO | Genotype Written in Correct Order onHomologs |
yellow | 310 | ywv+l+ | P | |
wildtype | 32 | | | |
yellow, wavy | 150 | | | |
wavy, large | 320 | | | |
wavy | 16 | | | |
large | 120 | | | |
yellow, large | 14 | | | |
yellow, wavy, large | 38 | | | |
Total | 1000 | | | |
a) How many sets of reciprocal phenotypes are shown?____________________
b) In Column C, list the corresponding genotype. Account for allthree traits. The first one has been provided for you as anexample. For all answers in column C, use the order of traits: furcolor, fur texture, ear size.
c) Indicate the type of each homolog in Column D: parental P,single crossover SCO, or double crossover DCO. The first one hasbeen provided for you as an example.
d) On this form below or on blank paper to be submitted withthis form, determine the correct order of all three genes. All workmust be shown for credit. Fill in Column E above.
